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Title:
The ellipticities of globular clusters and the cyanogen problem
Authors:
Norris, John
Affiliation:
AA(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. L65-L68. (ApJL Homepage)
Publication Date:
02/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cyanogen, Ellipticity, Globular Clusters, Stellar Rotation, Abundance, Angular Momentum, Red Giant Stars, Stellar Evolution
DOI:
10.1086/184832
Bibliographic Code:
1987ApJ...313L..65N

Abstract

For globular clusters having Fe/H between -1.9 and -1.2 a positive correlation is shown to exist between the degree of cyanogen enrichment in the red giants of a given cluster and the apparent flattening of that system. This suggests that angular momentum is an important key to the understanding of cyanogen anomalies within clusters and offers support for the idea that evolutionary mixing, driven by rotation, is responsible for a large part of the phenomenon. Not all observations, however, can be readily explained in this manner, and a short discussion is given of desiderata needed to clarify the problem.

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